Images taken near the border crossing separating Tijuana from San Diego, Calif., showed a cloud of tear gas that sent people running and screaming, including families with young children in diapers.

Fear and loathing over immigration won Donald Trump the White House in 2016. That's why Trump is so focused on immigration ahead of Tuesday's mid-term vote, Jackson Proskow says.

Addressing thousands of supporters at a campaign rally in Montana, Trump accused Democrats of supporting migrants coming to the U.S. because they "figure everybody coming in is going to vote Democrat."